lidR
: (A workshop for) Airborne lidar Data Manipulation and Visualization for Environmental Applications
Liam A.K. Irwin, Brent Murray
Overview
Li
ght
D
etection
a
nd
R
anging (lidar)
The lidR package - a brief introduction
Workshop overview
What is lidar?
Li
ght
D
etection
a
nd
R
anging
Active form of remote sensing
Measures distance to target surfaces with millions of narrow light pulses
Airborne laser scanning performs lidar systematically from aircraft or drones
Lidar Data – Point Clouds
Discrete returns are aggregated into point clouds (
.LAS/.LAZ
)
Lidar points have three-dimensional (
XYZ
) coordinates, and other attributes (
Intensity
,
ReturnNumber
, etc…)
Point clouds can be processed into summaries of vegetation structure with
lidR
lidR
Written by
Jean-Romain Roussel
Package for
manipulating
and
visualizing
ALS data
Written entirely open source within R-geospatial ecosystem (
terra
/
sf
)
Most processes run efficiently with back-end
C++
code
Workshop Outline
Introduction to lidar and lidR (09:00)
Reading LAS and LAZ files (09:10)
Point Classification and filtering (9:15)
Digital Terrain Models and Height Normalization (9:25)
Canopy Height Models (9:35)
lidar Summary Metrics (9:50)
File Collection Processing Engine (10:10)
Get Set Up!